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ELF waves in the presence of exponential ionospheric conductivity profiles

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1 Author(s)
Galejs, Janis ; Applied Research Laboratory, Sylvania Electric Products Inc., Waltham, MA, USA

Based on the theory of Nicolet and Ailkin, the profile of ionospheric conductivity exhibits a nearly exponential variation with altitude through the D layer and the lower edge of the E layer. Propagation of ELF waves below this exponential layer is considered after calculating the surface impedance Z_{s} at an altitude h where the local refractive index n does not necessarily satisfy |n|\gg1 . The propagation constant is determined by an iteration process. This model of an isotropic nonhomogeneous ionosphere is a closer approximation of the propagation geometry than are earlier models, where Z_{s} was defined at h where |n|\gg1 . The present model accounts simultaneously for ELF attenuation rates as measured by Jean, and earth-ionosphere cavity resonances as observed by Balser and Wagner.

Published in:

Antennas and Propagation, IRE Transactions on  (Volume:9 ,  Issue: 6 )